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Chapter 1 150311 V1.1
Arduino Uno
Arduino Uno R3 Front Arduino Uno R3 Back
Arduino Uno R2 Front Arduino Uno SMD Arduino Uno Front Arduino Uno Back
Chapter 2 Overview
The Arduino Uno is a microcontroller board based on the ATmega328 datasheet
. It has 14 digital inputoutput pins of which 6 can be used as PWM outputs, 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a
power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or
power it with a AC-to-DC adapter or battery to get started. The Uno differs from all preceding boards in that it does not use the FTDI USB-
to-serial driver chip. Instead, it features the Atmega16U2 Atmega8U2 up to version R2 programmed as a USB-to-serial converter.
Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground,
making it easier to put into DFU mode
. Revision 3
of the board has the following new features:
•
1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that
allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR,
Universitas Sumatera Utara
40 which operate with 5V and with the Arduino Due that operate with 3.3V.
The second one is a not connected pin, that is reserved for future purposes.
•
Stronger RESET circuit.
•
Atmega 16U2 replace the 8U2. Uno means one in Italian and is named to mark the upcoming release of
Arduino 1.0. The Uno and version 1.0 will be the reference versions of Arduino, moving forward. The Uno is the latest in a series of USB Arduino boards, and the
reference model for the Arduino platform; for a comparison with previous versions, see the
index of Arduino boards .
Chapter 3 Summary
Microcontroller ATmega328
Operating Voltage 5V
Input Voltage recommended 7-12V
Input Voltage limits 6-20V
Digital IO Pins 14 of which 6 provide PWM output
Analog Input Pins 6
DC Current per IO Pin 40 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB ATmega328 of which 0.5 KB used by bootloader
SRAM 2 KB ATmega328
EEPROM 1 KB ATmega328
Clock Speed 16 MHz
Chapter 4 Schematic Reference Design
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